Match fixing happens everywhere but it is only easier to detect in the smaller leagues
Various sports are guilty of this as well. In my opinion, individual competitions
for instance horse racing and boxing are more vulnerable to such manipulation compared to team sports.
In the case of under table agreements the latter would demands silence and secrecy from every player involved into such corrupted matches. Regarding the smaller leagues, agreed, here this phenomena is much easier to detect compared to high leagues.
Match-fixing in team sports is often carried out by senior team members or coaches without the players' involvement. It can be more difficult to detect because players are less likely to notice such manipulations within their own team.
It is impossible to figure it out if the sport team match is being an arrangements or the teams, a player or the coach in particular.
Noting that in some fixed match that concerns the coach alone, he could just decide to bench his key players that might be goalies so that nomatter how best the weak players could strong to win they will end up loosing while the player(s) can also reach a manipulative plans without the coach that which is... They would play effortlessly not to bring victory to the team with their tricky playing patterns unknowingly to the coach.
Most especially, fixed matched are successful when the teams and the coach are working together so no player goes contrary to the agreement.